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Page 9 - Questions Answers with Multiple Choice

Electronics Quiz - Physics Quiz - Science Quiz

65. A sensor that changes resistance when light is illuminates it is:
 
  • photo impedance sensor
  • photo resistor sensor
  • photo current sensor
  • photo voltage sensor

66. On Earth, hydrogen is mostly found in what?

  • Water
  • Dirt
  • Air
  • Metals

67. Which is the heaviest natural element?

  • Bismuth
  • Magnesium
  • Aluminum
  • Uranium

68. How long does it take for light from the Sun to reach the Earth?

  • Eight minutes
  • Eight hours
  • Instantly
  • Eight seconds

69. What portion of the AC cycle is converted to DC by a full-wave rectifier?

  • 90 degrees
  • 180 degrees
  • 270 degrees
  • 360 degrees

70. The inductive reactance of a transformer depends on

  • Magnetic Flux
  • Leakage Flux
  • Electromotive Force
  • Magnetomotive Force

71. The function of the starter for a dc motor is

  • To increase field resistance
  • To reduce armature resistance
  • To limit the starting current
  • To limit the starting voltage

72. The Moon does not fall to Earth because

  • It is beyond the pull of Earth's gravity
  • It is being pulled by the Sun and planets as well as by the Earth
  • The net force on it is zero
  • None of the above
     
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